The South favored the spread of slavery because its economy depended on slave labor. On the other hand, the wanted skilled workers and opposed slavery.

1. A. Plantation

2. C. North

Explanation:

The South's economy was mainly based on Agriculture with large plantations growing Tobacco, Cotton, sugar cane etc. They needed labor on these farms and resorted to slave labor as it was cheaper and they could drive the slaves to work longer and harder.

The North on the other hand had started to industralise and therefore needed skilled labour who could work in the factories. They also looked down on slavery and took the lead in abolishing it.

it would have to be gasioline

by improved communication.